.shape-hollow-x {
    width: 600px;
    max-width: 100%;
    height: 300px;
    background: linear-gradient(red, green);
    position: relative;
}
.shape-hollow {
    position: absolute;
    left: 0; right: 0; top: 0; bottom: 0;
    margin: auto;
    background-color: rgba(0,0,0,.75);
    /* 实际开发需要-webkit- */
    mask: no-repeat center;
    mask-image: linear-gradient(black, black), url(./star.svg);
    mask-size: cover, 120px 120px;
    mask-composite: exclude;
    mask-composite: source-out;
}